[issue37380] subprocess.Popen._cleanup() "The handle is invalid" error when some old process is gone

[Chip Lynch]

Chip Lynch <chip at chiplynch.com> added the comment:

I see there is a merged patch for this (https://github.com/python/cpython/pull/14360); is it possible to get it tagged for backport to 3.7?  I haven't seen the 3.7.5 tag drop yet so wanted to recommend it's included, it's giving us fits.  On our Windows 10 dev boxes and Win 2016 servers, emanuel's repro fails 3.5.4, 3.6.8, 3.7.4, and 3.8.0b4, but not apparently 2.7 (I think we tested 2.7.12).  Per vstinner's request, I agree and would like to see it get a 3.7 and 3.8 backport.

Many thanks!

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nosy: +Chip Lynch

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<https://bugs.python.org/issue37380>
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